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Temperature Supervisor for Oil- immersed Transformers

Thermal monitoring of oil-immersed transformers is essential for their safe operation. This is the case for not only for large-scale equipment, but also for medium-sized transformers and distribution transformers, thus allowing maximum return from the investment in these assets to be achieved without jeopardizing their life cycle. The Temperature Supervisor's competitive cost allows the inclusion of thermal monitoring for small and medium size transformers. The advantage of digital temperature monitoring is no longer reserved for higher power transformers only. The TS eliminates the need for manual readings taken using electro-mechanical equipment, with significant increase in the level of accuracy, reliability and more efficient use of cooling both in operations and maintenance areas. The monitor features an input for an RTD sensor for measuring the temperature at the top of the oil, and an input for external CT clip-on type (accessory, sold separately), for measuring load current, performing the calculation of the temperature of the winding by thermal imaging. Optionally, the TS can be equipped with two additional temperature sensor inputs for measuring, for example, ambient temperature, on load tap changer or others.

Catalog

TS

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Main Features:

IED (Intelligent Electronic Device) designed specifically for substation yard conditions (interference,

extreme temperatures);

Real time temperature reading on display, with programmable display mode: indication of highest

temperature, automatic screen roll or fixed channel reading indication;

High-glow LED type display for easy visualization; and operation in extreme temperatures;

Serial communication port RS-485 (optional) for integration into supervision or remote monitoring

systems. Open communication protocols Modbus RTU or DNP3 level 1;

Self-calibrating Input for Pt100 Ω at 0 °C RTD type temperature sensors, ensuring high-level

accuracy and stability throughout the entire ambient temperature range;

Programmable analog output (optional) for remote temperature readings. Programmable output

range: 0...1, 0...5, 0...10, 0...20 or 4...20 mA;

Output relays for alarm indications, transformer trip, self-diagnostic and command of two-stage

forced cooling with Automatic/Manual selection. Forced activation of cooling in case of lack of

auxiliary power, internal fault or fault in temperature sensor (NC relays);

Internal clock with date and time and non-volatile memory for storage of readings (optional);

Self-diagnostic for internal fault detection. Total absence of mechanical parts for parameter setting

and calibration.

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Optional Functions

OPTION 1 – ADDITIONAL TEMPERATURE READINGS Additional inputs for measuring of up to two additional temperatures (for sensor Pt100 Ω at 0 °C), allowing

measuring of the temperature of the on load tap changer, ambient temperature or other;

OPTION 2 – ANALOG OUTPUT Programmable analog output for remote temperature reading indication, user selectable for display of

highest temperature or a pre-defined temperature. Programmable output range: 0...1, 0...5, 0...10, 0...20 or

4...20 mA;

OPTION 3 – SERIAL COMMUNICATION PORT RS-485 Serial communication port RS-485 for integration into remote supervision systems, allowing the

establishment of a temperature monitoring network covering the entire facility. User selectable

communication protocol in Modbus RTU or DNP3 level 1.

OPTION 4 – MASS MEMORY

Nonvolatile memory for storage of temperature readings and alarm events, trips and activation of forced cooling, based on internal clock with day, month, year, hour, minute and second. A memory recording can be started by:

- User defined time interval between recordings, or;

- Variation of any temperature monitored higher than the dead band selected by users, in °C, or;

- State change in any output relay (control of cooling, alarms, trips or self-diagnostic).

OPTION 5 – PRE-COOLING Pre-cooling can prolong the life cycle of insulation on transformers subject to overloads, by activating

cooling groups whenever previously user selected load levels are reached. Taking advantage of the high

thermal inertia of oil, the forced cooling system is activated even before the increase in temperature

occurs, this increases the times required to achieve high temperatures, which would cause an accelerated

loss of lifetime for the insulation. The following are user programmed:

- Load percentage for activation of the first forced cooling group;

- Load percentage for activation of second forced cooling group;

- Hysteresis for shut down of forced cooling when load level drops.

OPTION 6 – FAN EXERCISING The Fan Exercising function keeps fans from remaining inactive for long periods of time on transformers

operating at low load levels or during periods of low ambient temperatures. This prevents axle blockage

from accumulation of dirt or grease dry out and bird nesting. Fans are activated daily, in accordance with

the equipment's internal clock and dependent on the selections made by users:

- Time and minute for switching fans on;

- Total daily fan operation, between 0 and 100 minutes.

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Technical Specifications

Conditions Interval/Description Input Voltage: 38…265 Vac/Vdc, 50/60 Hz

Maximum Consumption: < 5 W

Operating Temperature: -40…+85 °C

Degree of Protection: IP 20

Wire size – removable connectors: 22…12 AWG, 0.3…2.5 mm²

Fixation: Built in panel

Direct temperature measurements:

Sensor: Measuring range:

Maximum error at 20 °C: Deviation by temperature variation:

Type of connection:

One (standard, oil temperature) or three (optional) Pt100 Ω at 0 °C with continuous self-calibration -55...+200 °C 0.5 % of full scale 20 ppm / °C 3-wire sensor

Winding temperature measurement:

Mathematical models applied:

Calculated IEEE C57.91-1995 IEC 354 - 1991 ABNT NBR 5416-1997

AC measurement input:

Working range: Maximum error at 20 °C:

Deviation by temperature variation:

With external clip-on CT (accessory required) 0...10 A 1 % of full scale 50 ppm / °C referred to full scale

Analog output (optional):

Maximum error: Options (selections) and maximum load:

One 0.5 % of full scale 0...1 mA, 10 kΩ 0...5 mA, 2 kΩ 0...10 mA, 1 kΩ 0...20 mA, 500 Ω 4...20 mA, 500 Ω

Relay outputs:

Maximum switching power: Maximum switching voltage:

Maximum conduction current:

Seven dry contacts 70 W / 250 VA (resistive) 250 Vdc / 250 Vac 5 A

Serial Communication Port (optional):

1 RS-485, supervision/monitoring system

Communication protocols:

Modbus RTU or DNP3 level 1

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Connection Diagram

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Dimensions

Order Specification

The Temperature Supervisors TS are universal devices; its features are selected by using the programming menus. These adjustments can be made directly on the device’s front panel or by way of configuration software, using the serial communication port RS-485 (optional). The power supply input is universal (38 to 265 Vac/Vdc, 50/60 Hz). Therefore, in purchase orders for the equipment the following need to be informed:

Temperature Supervisor TS - Quantity; - Option to link to the contact 27: Model 1 and Model 2; - Desired optional functions among options 1 to 6 (any optional combination is possible).

Accessories:

Clip-on CT (not included in TS) - Quantity.

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Accessories External Split Core Clip-on CTs External clip-on CTs with a split core is required for the operation of the TS. This item is supplied in the quantity that is required for the desired application, which should be specified in the purchase order.

Operating Temperature: -40 to +85 °C. Dimensions in mm.

Temperature sensor Pt100 Ω at 0 °C Usually, a temperature sensor, installed in a thermo-well, at the cover of the transformer, measures the top oil temperature. The sensors must be of the Pt100 Ω at 0 °C type. If needed, Treetech offers temperature sensors of the Pt100 Ω type with connection head or flexible wiring harness.

Characteristics

Standard: ASTM E1137, class B Alpha Coefficient: 0.3850 Ω/°C Measurement Range

-100…+300 °C

Head: Cast Aluminum, painted Bulb (rod) Stainless Steel Cable gland: Nickel-plated Tin Chain: Nickel-plated Tin Screws: Nickel-plated Tin or

stainless steel Adapter Stainless Steel Insulation: 2.5 kV, 50/60 Hz, 1 min

ALL DIMENSIONS ARE IN mm

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Weather shelter

If ambient temperature measurement is desired in unguarded locations, a weather shelter should be used to protect the Pt100 Ω at 0 °C sensor, minimizing errors that sun, rain, wind, etc. could cause in the measurement. Treetech has a suitable weather shelter.

Cabinet for Outdoor Installation The TS must always be sheltered from weather conditions. Thus, it is often installed inside some building, like a control room. When it’s not convenient, as when retrofitting old transformers, the TS may be supplied in an easy to install weather-proof cabinet.

CHARACTERISTICS:

Fastening: Bolted with high load capacity magnets

TSs fastening: Removable rack

Wiring connections: Multipolar removable plug at the bottom of the cabinet

Protection degree: IP55

Insulation Test: 2 kV, 50/60 Hz, 1 min

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Type Testing

Surge Immunity (IEC 60255-22-5):

Phase-neutral surges: Phase-ground and neutral-ground surges:

1 kV, 5 per polarity (+/-) 2 kV, 5 per polarity (+/-)

Electrical transients Immunity (IEC 60255-22-1 and IEEE C37.90.1):

1st cycle peak Frequency:

Time and repetition rate: Decay to 50%:

2.5 kV 1.1 MHz 2 seconds, 400 surges/sec 5 cycles

Voltage Impulse (IEC 60255-5): Wave form:

Amplitude and energy: Number of pulses:

1.2 / 50 s 5 kV, 0.5 J 3 negative and 3 positive, 5 s interval

Insulation Voltage (IEC 60255-5): Industrial frequency insulation voltage

2 kV, 60 Hz, 1 min to ground

Irradiated electromagnetic field Immunity (IEC 61000-4-3 / IEC60255-22-3):

Frequency: Field intensity:

26…1000 MHz 10 V/m

Conduced electromagnetic perturbations immunity (IEC 61000-22-6):

Frequency: Field intensity:

0.15…80 MHz 10 V/m

Electrostatic Discharge (IEC 60255-22-2 and

IEEE C37.90.3): Air mode:

Contact mode: 8 kV, ten discharges per polarity 6 kV, ten discharges per polarity

Fast electrical transient immunity (IEC60255-22-4

and IEEE C37.90.1): Power supply, inputs and outputs:

Serial communication port:

4 kV 2 kV

Climatic test: (IEC 60068-2-14):

Temperature range: Total test time:

-40…+85 °C 96 hours

Vibration response: (IEC 255-21-1):

Application mode: Amplitude:

Duration:

3 axis (X, Y and Z), sinusoidal 0.075 mm from 10…58 Hz 1 G from 58…150 Hz 8 min/axis

Vibration resistance: (IEC 255-21-1):

Application mode: Frequency

Amplitude: Duration:

3 axis (X, Y and Z), sinusoidal 10…150 Hz 2 G 160 min/axis

Short duration overload (IEEE C57.109-1993 and NOR 8145/83)

On AC current measurement input

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BRAZIL

Treetech Sistemas Digitais Ltda

Praça Claudino Alves, 141, Centro

CEP 12.940-000 - Atibaia/SP

+ 55 11 2410-1190

comercial@treetech.com.br

www.treetech.com.br